define(['webuploader'], function(WebUploader) {
	return {
		bootstrap: function( params ){
			this.formData = params.formData;
			this.server = params.server;
			this.callback = params.callback;

			this.render();
		},
		render: function(){
			var _this = this,

				$wrap = $('#uploader'),

			// 图片容器
				$queue = $( '<ul class="filelist"></ul>' )
					.appendTo( $wrap.find( '.queueList' ) ),

			// 状态栏，包括进度和控制按钮
				$statusBar = $wrap.find( '.statusBar' ),

			// 文件总体选择信息。
				$info = $statusBar.find( '.info' ),

			// 上传按钮
				$upload = $wrap.find( '.uploadBtn' ),

			// 没选择文件之前的内容。
				$placeHolder = $wrap.find( '.placeholder' ),

				$progress = $statusBar.find( '.progress' ).hide(),

			// 添加的文件数量
				fileCount = 0,

			// 添加的文件总大小
				fileSize = 0,

			// 优化retina, 在retina下这个值是2
				ratio = window.devicePixelRatio || 1,

			// 缩略图大小
				thumbnailWidth = 160 * ratio,
				thumbnailHeight = 160 * ratio,

			// 可能有pedding, ready, uploading, confirm, done.
				state = 'pedding',

			// 所有文件的进度信息，key为file id
				percentages = {},
			// 判断浏览器是否支持图片的base64
				isSupportBase64 = ( function() {
					var data = new Image();
					var support = true;
					data.onload = data.onerror = function() {
						if( this.width != 1 || this.height != 1 ) {
							support = false;
						}
					}
					data.src = "";

					return support || jAlert('您的浏览器不支持此上传控件');
				} )(),

			// 检测是否已经安装flash，检测flash的版本
				flashVersion = ( function() {
					var version;

					try {
						version = navigator.plugins[ 'Shockwave Flash' ];
						version = version.description;
					} catch ( ex ) {
						try {
							version = new ActiveXObject('ShockwaveFlash.ShockwaveFlash')
								.GetVariable('$version');
						} catch ( ex2 ) {
							version = '0.0';
						}
					}
					version = version.match( /\d+/g );
					return parseFloat( version[ 0 ] + '.' + version[ 1 ], 10 );
				} )(),

				supportTransition = (function(){
					var s = document.createElement('p').style,
						r = 'transition' in s ||
							'WebkitTransition' in s ||
							'MozTransition' in s ||
							'msTransition' in s ||
							'OTransition' in s;
					s = null;
					return r;
				})(),

			// WebUploader实例
				uploader;

			if ( !WebUploader.Uploader.support('flash') && WebUploader.browser.ie ) {

				// flash 安装了但是版本过低。
				if (flashVersion) {
					(function(container) {
						window['expressinstallcallback'] = function( state ) {
							switch(state) {
								case 'Download.Cancelled':
									jAlert('您取消了更新！')
									break;

								case 'Download.Failed':
									jAlert('安装失败')
									break;

								default:
									jAlert('安装已成功，请刷新！');
									break;
							}
							delete window['expressinstallcallback'];
						};

						var swf = './expressInstall.swf';
						// insert flash object
						var html = '<object type="application/' +
							'x-shockwave-flash" data="' +  swf + '" ';

						if (WebUploader.browser.ie) {
							html += 'classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" ';
						}

						html += 'width="100%" height="100%" style="outline:0">'  +
							'<param name="movie" value="' + swf + '" />' +
							'<param name="wmode" value="transparent" />' +
							'<param name="allowscriptaccess" value="always" />' +
							'</object>';

						container.html(html);

					})($wrap);

					// 压根就没有安转。
				} else {
					$wrap.html('<a href="http://www.adobe.com/go/getflashplayer" target="_blank" border="0"><img alt="get flash player" src="http://www.adobe.com/macromedia/style_guide/images/160x41_Get_Flash_Player.jpg" /></a>');
				}

				return;
			} else if (!WebUploader.Uploader.support()) {
				jAlert( 'Web Uploader 不支持您的浏览器！');
				return;
			}

			// 实例化
			uploader = WebUploader.create({
				/*指定选择文件的按钮容器*/
				pick: {
					id: '#filePicker',
					label: '点击选择图片'
				},
				/*指定接受哪些类型的文件*/
				accept: {
					title: 'Images',
					extensions: 'gif,jpg,jpeg,bmp,png',
					mimeTypes: 'image/*'
				},
				/*上传前是否压缩*/
				compress: false,
				/*文件上传请求的参数表*/
				formData: this.formData,
				/*指定Drag And Drop拖拽的容器*/
				dnd: '#dndArea',
				/*指定监听paste事件的容器*/
				paste: '#uploader',
				/*flash地址*/
				swf: '/js/libs/webuploader-0.1.5/Uploader.swf',
				/*是否分片上传*/
				chunked: false,
				/*如果要分片，分多大一片*/
				chunkSize: 512 * 1024,
				/*上传处理文件地址*/
				server: this.server,
				/*禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开*/
				disableGlobalDnd: true,
				/*验证文件总数量, 超出则不允许加入队列*/
				fileNumLimit: 300,
				/*验证文件总大小是否超出限制*/
				fileSizeLimit: 200 * 1024 * 1024,    // 200 M
				/*验证单个文件大小是否超出限制*/
				fileSingleSizeLimit: 50 * 1024 * 1024    // 50 M
			});

			// 拖拽时不接受 js, txt 文件。
			/*uploader.on( 'dndAccept', function( items ) {
				var denied = false,
					len = items.length,
					i = 0,
				// 修改js类型
					unAllowed = 'text/plain;application/javascript ';

				for ( ; i < len; i++ ) {
					// 如果在列表里面
					if ( ~unAllowed.indexOf( items[ i ].type ) ) {
						denied = true;
						break;
					}
				}

				return !denied;
			});*/

			/*文件排序*/
			/*uploader.on('filesQueued', function() {
			 uploader.sort(function( a, b ) {
			 if ( a.name < b.name )
			 return -1;
			 if ( a.name > b.name )
			 return 1;
			 return 0;
			 });
			 });*/

			// 添加“继续添加”的按钮，
			uploader.addButton({
				id: '#filePicker2',
				label: '继续添加'
			});

			uploader.on('ready', function() {
				_this.uploader = uploader;
				$('#dndArea').find('p').html('或将照片拖到这里，单次最多可选300张');
				$('.webuploader-pick').next('div').css({'top':'20px','left':'368px'})
			});

			// 当有文件添加进来时执行，负责view的创建
			function addFile( file ) {
				var $li = $( '<li id="' + file.id + '">' +
						'<p class="title">' + file.name + '</p>' +
						'<p class="imgWrap"></p>'+
						'<p class="progress"><span></span></p>' +
						'</li>' ),

					$btns = $('<div class="file-panel">' +
						'<span class="cancel">删除</span>' +
						'<span class="rotateRight">向右旋转</span>' +
						'<span class="rotateLeft">向左旋转</span></div>').appendTo( $li ),
					$prgress = $li.find('p.progress span'),
					$wrap = $li.find( 'p.imgWrap' ),
					$info = $('<p class="error"></p>'),

					showError = function( code ) {
						switch( code ) {
							case 'exceed_size':
								text = '文件大小超出';
								break;

							case 'interrupt':
								text = '上传暂停';
								break;

							default:
								text = '上传失败，请重试';
								break;
						}

						$info.text( text ).appendTo( $li );
					};

				if ( file.getStatus() === 'invalid' ) {
					showError( file.statusText );
				} else {
					//
					$wrap.text( '预览中' );
					uploader.makeThumb( file, function( error, src ) {
						var img;

						if ( error ) {
							$wrap.text( '不能预览' );
							return;
						}

						if( isSupportBase64 ) {
							img = $('<img src="'+src+'">');
							$wrap.empty().append( img );
						} else {
							$.ajax('../../server/preview.php', {
								method: 'POST',
								data: src,
								dataType:'json'
							}).done(function( response ) {
								if (response.result) {
									img = $('<img src="'+response.result+'">');
									$wrap.empty().append( img );
								} else {
									$wrap.text("预览出错");
								}
							});
						}
					}, thumbnailWidth, thumbnailHeight );
					/*所有文件的进度信息，key为file id*/
					percentages[ file.id ] = [ file.size, 0 ];
					file.rotation = 0;
				}
				/*文件状态改变*/
				file.on('statuschange', function( cur, prev ) {

					if ( prev === 'progress' ) {
						$prgress.hide().width(0);
					} else if ( prev === 'queued' ) {
						$li.off( 'mouseenter mouseleave' );
						$btns.remove();
					}

					// 成功
					if ( cur === 'error' || cur === 'invalid' ) {
						console.log( file.statusText );
						showError( file.statusText );
						percentages[ file.id ][ 1 ] = 1;
					} else if ( cur === 'interrupt' ) {
						showError( 'interrupt' );
					} else if ( cur === 'queued' ) {
						percentages[ file.id ][ 1 ] = 0;
					} else if ( cur === 'progress' ) {
						$info.remove();
						$prgress.css('display', 'block');
					} else if ( cur === 'complete' ) {
						$li.append( '<span class="success"></span>' );
					}

					$li.removeClass( 'state-' + prev ).addClass( 'state-' + cur );
				});
				/*预览图鼠标移入*/
				$li.on( 'mouseenter', function() {

					$btns.stop().animate({height: 30});
				});
				/*预览图鼠标移出*/
				$li.on( 'mouseleave', function() {
					$btns.stop().animate({height: 0});
				});
				/*缩略图上方按钮点击*/
				$btns.on( 'click', 'span', function() {
					var index = $(this).index(),
						deg;

					switch ( index ) {
						case 0:
							uploader.removeFile( file );
							return;

						case 1:
							file.rotation += 90;
							break;

						case 2:
							file.rotation -= 90;
							break;
					}

					if ( supportTransition ) {
						deg = 'rotate(' + file.rotation + 'deg)';
						$wrap.css({
							'-webkit-transform': deg,
							'-mos-transform': deg,
							'-o-transform': deg,
							'transform': deg
						});
					} else {
						$wrap.css( 'filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (~~((file.rotation/90)%4 + 4)%4) +')');
						// use jquery animate to rotation
						// $({
						//     rotation: rotation
						// }).animate({
						//     rotation: file.rotation
						// }, {
						//     easing: 'linear',
						//     step: function( now ) {
						//         now = now * Math.PI / 180;

						//         var cos = Math.cos( now ),
						//             sin = Math.sin( now );

						//         $wrap.css( 'filter', "progid:DXImageTransform.Microsoft.Matrix(M11=" + cos + ",M12=" + (-sin) + ",M21=" + sin + ",M22=" + cos + ",SizingMethod='auto expand')");
						//     }
						// });
					}


				});

				$li.appendTo( $queue );
			}

			// 负责view的销毁
			function removeFile( file ) {
				var $li = $('#'+file.id);

				delete percentages[ file.id ];
				updateTotalProgress();
				$li.off().find('.file-panel').off().end().remove();
			}

			function updateTotalProgress() {
				var loaded = 0,
					total = 0,
					spans = $progress.children(),
					percent;

				$.each( percentages, function( k, v ) {
					total += v[ 0 ];
					loaded += v[ 0 ] * v[ 1 ];
				} );

				percent = total ? loaded / total : 0;


				spans.eq( 0 ).text( Math.round( percent * 100 ) + '%' );
				spans.eq( 1 ).css( 'width', Math.round( percent * 100 ) + '%' );
				updateStatus();
			}

			function updateStatus() {
				var text = '', stats;

				if ( state === 'ready' ) {
					text = '选中' + fileCount + '张图片，共' +
						WebUploader.formatSize( fileSize ) + '。';
				} else if ( state === 'confirm' ) {
					stats = uploader.getStats();
					if ( stats.uploadFailNum ) {
						text = '已成功上传' + stats.successNum+ '张照片至XX相册，'+
							stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
					}

				} else {
					stats = uploader.getStats();
					text = '共' + fileCount + '张（' +
						WebUploader.formatSize( fileSize )  +
						'），已上传' + stats.successNum + '张';

					if ( stats.uploadFailNum ) {
						text += '，失败' + stats.uploadFailNum + '张';
					}
				}

				$info.html( text );
			}

			function setState( val ) {
				var file, stats;

				if ( val === state ) {
					return;
				}

				$upload.removeClass( 'state-' + state );
				$upload.addClass( 'state-' + val );
				state = val;

				switch ( state ) {
					case 'pedding':
						$placeHolder.removeClass( 'element-invisible' );
						$queue.hide();
						$statusBar.addClass( 'element-invisible' );
						uploader.refresh();
						break;

					case 'ready':
						$placeHolder.addClass( 'element-invisible' );
						$( '#filePicker2' ).removeClass( 'element-invisible');
						$queue.show();
						$statusBar.removeClass('element-invisible');
						uploader.refresh();
						break;

					case 'uploading':
						$( '#filePicker2' ).addClass( 'element-invisible' );
						$progress.show();
						$upload.text( '暂停上传' );
						break;

					case 'paused':
						$progress.show();
						$upload.text( '继续上传' );
						break;

					case 'confirm':
						$progress.hide();
						$( '#filePicker2' ).removeClass( 'element-invisible' );
						$upload.text( '开始上传' );

						stats = uploader.getStats();
						if ( stats.successNum && !stats.uploadFailNum ) {
							setState( 'finish' );
							return;
						}
						break;
					case 'finish':
						stats = uploader.getStats();
						if ( stats.successNum ) {
							_this.callback();
						} else {
							// 没有成功的图片，重设
							state = 'done';
							location.reload();
						}
						break;
				}

				updateStatus();
			}

			uploader.onUploadProgress = function( file, percentage ) {
				var $li = $('#'+file.id),
					$percent = $li.find('.progress span');

				$percent.css( 'width', percentage * 100 + '%' );
				percentages[ file.id ][ 1 ] = percentage;
				updateTotalProgress();
			};
			/**/
			uploader.onFileQueued = function( file ) {
				fileCount++;
				fileSize += file.size;

				if ( fileCount === 1 ) {
					$placeHolder.addClass( 'element-invisible' );
					$statusBar.show();
				}

				addFile( file );
				setState( 'ready' );
				updateTotalProgress();
			};
			/*从上传列表移出*/
			uploader.onFileDequeued = function( file ) {
				fileCount--;
				fileSize -= file.size;

				if ( !fileCount ) {
					setState( 'pedding' );
				}

				removeFile( file );
				updateTotalProgress();

			};

			uploader.on( 'all', function( type ) {
				var stats;
				switch( type ) {
					case 'uploadFinished':
						setState( 'confirm' );
						break;

					case 'startUpload':
						setState( 'uploading' );
						break;

					case 'stopUpload':
						setState( 'paused' );
						break;

				}
			});

			uploader.onError = function( code ) {
				switch(code){
					case 'Q_EXCEED_NUM_LIMIT':
						jAlert( 'Eroor: 上传文件总数量超过最大限制' );
						break;
					case 'Q_EXCEED_SIZE_LIMIT':
						jAlert( 'Eroor: 上传文件总大小超过最大限制' );
						break;
					case 'Q_TYPE_DENIED':
						jAlert( 'Eroor: 上传文件类型不容许' );
						break;
				}
			};

			$upload.on('click', function() {
				if ( $(this).hasClass( 'disabled' ) ) {
					return false;
				}

				if ( state === 'ready' ) {
					uploader.upload();
				} else if ( state === 'paused' ) {
					uploader.upload();
				} else if ( state === 'uploading' ) {
					uploader.stop();
				}
			});

			$info.on( 'click', '.retry', function() {
				uploader.retry();
			} );
			/*忽略*/
			$info.on( 'click', '.ignore', function() {

			} );

			$upload.addClass( 'state-' + state );
			updateTotalProgress();
		},
		destroy: function(){

			this.uploader && this.uploader.destroy();
		}
	}
});